<template>
  <div>
    <span>全选:</span>
    <input
      type="checkbox"
      v-model="isAll"
    />
    <button @click="fanBtn">反选</button>
    <ul>
      <li
        v-for="(obj,ind) in arr"
        :key="ind"
      >
        <input
          type="checkbox"
          v-model="obj.c"
        />
        <span>{{obj.name}}</span>
      </li>
    </ul>
  </div>
</template>

<script>
export default {
  data () {
    return {
      arr: [
        {
          name: "猪八戒",
          c: false,
        },
        {
          name: "孙悟空",
          c: false,
        },
        {
          name: "唐僧",
          c: false,
        },
        {
          name: "白龙马",
          c: false,
        },
      ],
    };
  },
  computed: {
    isAll: {
      set (val) {
        this.arr.forEach(obj => obj.c = val)
      },
      get () {
        return this.arr.every((obj) => obj.c === true)
      }
    }
  },
  methods: {
    fanBtn () {
      this.arr.forEach((obj) => obj.c = !obj.c)
    }
  }
};
</script>

<style>
</style>